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Old Oct 29th 2017, 11:49 AM   #1
Oldschool
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synthesis of ammonium magnesium phosphate x 6 H2O

Any help appreciated, it's been 37 yrs. since I was in univ. chemistry class.

Trying to flesh out the stochiometric/molar quantities (grams) of magnesium oxide to be combined with monoammoniumphosphate (MAP, a common fertilizer) to create ammonium magnesium phosphate x 6 H2O ?

I'm guessing I can simply heat it the combination in distilled H2O on a magnetic stirrer overnight, then try cooling it to separate by crystals , but I have read that AMP is sparingly soluble in water, so maybe just push pH slightly above 7, cool in fridge, decant and harvest the "sludge" or crystals ?

This substance is a common problem in sewage treatment plants where it precipitates on pipes, as well as kidney stones in humans and dogs.
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